linux-ext4 - Re: [EXT4 set 9][PATCH 5/5]Extent micro cleanups

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Date:	Wed, 11 Jul 2007 17:29:35 -0400
From:	Mingming Cao <cmm@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [EXT4 set 9][PATCH 5/5]Extent micro cleanups

On Tue, 2007-07-10 at 23:20 -0700, Andrew Morton wrote:
> On Sun, 01 Jul 2007 03:38:59 -0400 Mingming Cao <cmm@...ibm.com> wrote:
> 
> > From: Dmitry Monakhov <dmonakhov@...ru>
> > Subject: ext4: extent macros cleanup
> > 
> > - Replace math equation to it's macro equivalent
> 
> s/it's/its/;)
Okay.

> 
> > - make ext4_ext_grow_indepth() indexes/leaf correct
> 
> hm, what was wrong with it?
> 
Looking at the code, ext4_ext_ext_grow_indepth() implements tree growing
procedure. It allocates a new index block, moves the top-level data of
the tree(root or leaf blocks in i_data) into the new block, initializes
the new root, creating index that points to the just created index block

The original top-level data (in i_data) could be extent tree root (index
block) or extents (leaf block). The current code (without the patch)
treats the top-level data always be the leaf block, which is incorrect.


assumes when the tree is growing the extent structure pass in is always
> > @@ -922,8 +922,11 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
> >  	curp->p_hdr->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode));
> >  	curp->p_hdr->eh_entries = cpu_to_le16(1);
> >  	curp->p_idx = EXT_FIRST_INDEX(curp->p_hdr);
> > -	/* FIXME: it works, but actually path[0] can be index */
> > -	curp->p_idx->ei_block = EXT_FIRST_EXTENT(path[0].p_hdr)->ee_block;
> > +	
> > +	if (path[0].p_hdr->eh_depth)
> > +	  curp->p_idx->ei_block = EXT_FIRST_INDEX(path[0].p_hdr)->ei_block;
> > +	else
> > +	  curp->p_idx->ei_block = EXT_FIRST_EXTENT(path[0].p_hdr)->ee_block;
> 
> whitespace bustage there.
> 
> 
> -
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